The member who got both the make and model generally has the best answer I would say. Wrens were made from the late 50s to the late 70s possibly later. The early ones barely resemble the one you have, those started in the early 60s maybe 62-63. I've had several over the years and other than the offset rear wheel they are terrific bikes, too much top speed and they are sketchy to ride but 35mph and under you are fine. Make sure the brake works well, Clark manufacturing makes a replacement pad for it. He is a Vendor here.